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| author | Betty Dall <betty.dall@hpe.com> | 2016-04-30 18:03:37 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-05-04 23:47:31 +0200 |
| commit | 6283f97d5fbfdd1e31694d7f6000eb728cdfba77 (patch) | |
| tree | 94aaf61a8cd41f9779103adf9d7b6e309358cd60 /drivers/acpi/device_sysfs.c | |
| parent | arm64: defconfig: Enable ACPI (diff) | |
| download | linux-6283f97d5fbfdd1e31694d7f6000eb728cdfba77.tar.xz linux-6283f97d5fbfdd1e31694d7f6000eb728cdfba77.zip | |
ACPI / device_sysfs: Add sysfs support for _HRV hardware revision
The ACPI _HRV object on the device is used to supply Linux with the
device's hardware revision. This is an optional object. Add sysfs support
for the _HRV object if it exists on the device.
This change allows users to easily find the hardware version of non-PCI
hardware by looking at the sysfs 'hrv' file. It is most useful for
non-PCI devices because lspci can list the hardware version for PCI
devices.
Signed-off-by: Betty Dall <betty.dall@hpe.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/device_sysfs.c')
| -rw-r--r-- | drivers/acpi/device_sysfs.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c index b9afb47db7ed..49cc0cbff0b8 100644 --- a/drivers/acpi/device_sysfs.c +++ b/drivers/acpi/device_sysfs.c @@ -473,6 +473,21 @@ acpi_device_sun_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); +static ssize_t +acpi_device_hrv_show(struct device *dev, struct device_attribute *attr, + char *buf) { + struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long hrv; + + status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv); + if (ACPI_FAILURE(status)) + return -EIO; + + return sprintf(buf, "%llu\n", hrv); +} +static DEVICE_ATTR(hrv, 0444, acpi_device_hrv_show, NULL); + static ssize_t status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); @@ -541,6 +556,12 @@ int acpi_device_setup_files(struct acpi_device *dev) goto end; } + if (acpi_has_method(dev->handle, "_HRV")) { + result = device_create_file(&dev->dev, &dev_attr_hrv); + if (result) + goto end; + } + if (acpi_has_method(dev->handle, "_STA")) { result = device_create_file(&dev->dev, &dev_attr_status); if (result) @@ -604,6 +625,9 @@ void acpi_device_remove_files(struct acpi_device *dev) if (acpi_has_method(dev->handle, "_SUN")) device_remove_file(&dev->dev, &dev_attr_sun); + if (acpi_has_method(dev->handle, "_HRV")) + device_remove_file(&dev->dev, &dev_attr_hrv); + if (dev->pnp.unique_id) device_remove_file(&dev->dev, &dev_attr_uid); if (dev->pnp.type.bus_address) |